If you are going on an expedition and are looking for an exceptional sleeping bag that will keep you warm and is also durable enough to take the punishment often encountered in extreme conditions, then this is the bag for you. 

Materials & Construction
Fabrics: The outer shells and linings of our Gemini bags are made using 20D nylon, a light, tightly woven, strong, durable fabric. It has been specially treated during the manufacturing process to make it downproof and water repellant (DWR finish). The 20D fabric weighs approximately 1.0 ounce per yard. 
Down: Our insulating material is super lofting, highly compressible 900 fill power HyperDRY™* water-resistant, RDS (Responsible Down Standard) certified goose down. We overfill the Gemini by 80% which adds some weight and cost, but in the long run it produces a better bag since the down does not shift in the tubes and always produces the maximum design loft. 
Zipper: The zipper in the Gemini is a full length, 72 inch, number 5, two way, separating YKK® coil zipper. We back the zipper with our full thickness, no-draft flap. 
Side Block Baffle: The side block baffle is located on the side opposite the zipper and is used to keep the down from shifting from top to bottom and vise versa. This baffle also shortens the effective length of the tubes further eliminating down shift. We put 60% of the down in the top of the bag to put the insulation where it is most effective.
Differential Construction: We use differential construction in all of our down quilts and bags. This means that the outer fabric has a greater girth than the inner. Imagine a smaller circle drawn inside a larger circle. This construction allows the down to loft even when you push out from the inside. In a quilt or bag that is not differentially cut, it is easy to compress the down to a minimal thickness by pushing from the inside. This design feature takes more materials and more time to make, but it results in a superior product. 
Other Materials: It should be noted that we also use nylon thread, nylon baffle materials and nylon draw cords. 
We take pride in using the best materials and carefully crafting a product that will last for many, many years.

Sizes & Temperature Ratings
Widths: The Gemini has an inner circumference of 64 inches. To ensure a proper fit please go to our sleeping bag sizing page to double check.
Lengths: The Gemini comes in two different lengths, regular, that fits individuals up to 5’ feet 11 inches, and long that fits individuals up to 6 feet 3 inches in height. Longer or shorter versions can be made on special order. Contact us for a quote. 
Temperature Rating/Loft: The loft, that is the thickness of the bag, determines its temperature rating, the thicker the bag the lower its temperature rating. Check out our video for a discussion about keeping warm. 

Key Features:

• Durable, light weight 20D downproof, DWR nylon shell and lining
• 900 fill power HyperDRY®* water-resistant RDS (Responsible Down Standard) certified goose down
• 80% overfilled to ensure consistent, non-shifting insulation thickness
• Differential construction to ensure maximum design loft is achieved
• Side block baffle to maintain a 60:40 top to bottom insulation distribution
• Fully baffled internal construction with no sewn through seams eliminating cold spots
• 72 inch, number 5 two way separating YKK®** zipper backed with full thickness, no-draft flap

** YKK® is a registered trademark of the YKK Corporation

[GEMINI SIZING]